1. The brain volumes (cm3) of 19 brains have a mean of 1,308.8 cm³ and a standard deviation of 139.7 cm³. For such data, Brain volume of lesser than what would be significantly (or unusually) low?

2. The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 227.8 and a standard deviation of 16.6. What is the approximate percentage of women with (or at least what percentage of women have) platelet counts within one standard deviation of the mean?

3. The body temperatures of a group of healthy adults have a uniform distribution with a mean of 98.99 ^oF and a standard deviation of 0.23 ^oF. What is the approximate percentage of body temperatures (or at least what percent of body temperatures are) within two standard deviations of the mean?

4. Scores on a test have a mean of 65 and a standard deviation of 9. Michelle has a score of 65.37. Convert Michelle's score to a z-score.

5. A time for the 100-meter sprint of 21.6 seconds at a school where the mean time for the 100-meter sprint is 18.3 seconds and the standard deviation is 4 seconds. Determine if the value is unusual. Explain. Enter the number that is being interpreted to arrive at your conclusion rounded to the nearest hundredth.

6. The weights (in pounds) of 16 newborn babies are listed below. Find Q₁.

6.2, 6.6, 5.5, 7.7, 7.1, 5.6, 6.5, 7.8, 6.5, 5.9, 5.6, 8.5, 6.4, 6.9, 6.6, 6.5

7. Find the percentile for the data value.

Data set: 42, 9, 56, 67, 56, 56, 48, 70, 90;

data value: 56

8. Which is better, a score of 91 on a test with a mean of 76 and a standard deviation of 9, or a score of 256 on a test with a mean of 248 and a standard deviation of 25? Enter the better test score.

9. The ages of the 12 members of a track and field team are listed below. Construct a boxplot for the data set. Enter the minimum value.

26, 23, 12, 18, 22, 19,27, 25, 27, 27, 19, 27